The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Note 6 - Stock-Based Compensation (Details) - Stock Options Outstanding and Exercisable (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding (in Shares)	582,681	722,155	810,457	919,371
Weighted-Average Exercise Price Outstanding	$ 10.17	$ 10.18	$ 10.09	$ 10.23
Weighted-Average Remaining Contractual Life	3 years 164 days
Stock Options Exercisable (in Shares)	446,631
Weighted-Average Exercise Price Exercisable	$ 10.98
Exercise Price Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price - Minimum	$ 5.76
Exercise Price - Maximum	$ 8.00
Stock Options Outstanding (in Shares)	244,190
Weighted-Average Exercise Price Outstanding	$ 5.76
Weighted-Average Remaining Contractual Life	5 years 102 days
Stock Options Exercisable (in Shares)	144,017
Weighted-Average Exercise Price Exercisable	$ 5.76
Exercise Price Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price - Minimum	$ 8.01
Exercise Price - Maximum	$ 10.00
Stock Options Outstanding (in Shares)	150,988
Weighted-Average Exercise Price Outstanding	$ 9.22
Weighted-Average Remaining Contractual Life	255 days
Stock Options Exercisable (in Shares)	150,988
Weighted-Average Exercise Price Exercisable	$ 9.22
Exercise Price Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price - Minimum	$ 10.01
Exercise Price - Maximum	$ 20.00
Stock Options Outstanding (in Shares)	110,292
Weighted-Average Exercise Price Outstanding	$ 12.55
Weighted-Average Remaining Contractual Life	4 years 10 days
Stock Options Exercisable (in Shares)	77,715
Weighted-Average Exercise Price Exercisable	$ 12.93
Exercise Price Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price - Minimum	$ 20.01
Exercise Price - Maximum	$ 24.46
Stock Options Outstanding (in Shares)	77,211
Weighted-Average Exercise Price Outstanding	$ 22.57
Weighted-Average Remaining Contractual Life	2 years 69 days
Stock Options Exercisable (in Shares)	73,911
Weighted-Average Exercise Price Exercisable	$ 22.68